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"Someone with diarrhea, someone who's not real clean, babies in the pool, older people, people changing diapers beside the pool," said Nancy Tausz of the Johnson County Health Department. "Kids in the pool or adults in the pool will swallow the water and not wash their hands."

Symptoms include diarrhea, abdominal cramps, fever and nausea and vomiting.

Health officials said they are working closely with pool operators in Overland Park and Shawnee for cautionary measures to close and/or treat those known swimming pools with which infected individuals visited.

The Soetart Aquatic Center in Shawnee is one of the facilities that the health department said might be affected. The pool was shut down on Wednesday and given a full chlorine shock treatment and officials said it no longer poses a danger.

Health officials said the Overland Park affected swimming pool is privately owned and managed by a homes' association. Overland Park posted a notice that the pool is closed.

Officials said they're still looking into whether more people might have become sick.

"It's a diarrhea disease, gastrointestinal. You're going to have fever, nausea or vomiting," said Tausz. "You could feel real sick to your stomach (or have) cramps. You might have one or you might have all of the symptoms."

Anyone who thinks they might have this should contact a doctor and begin treatment. Symptoms usually develop two to 10 days after exposure. It is still very contagious for up to two weeks after the symptoms stop, so people with the symptoms need to avoid public pools for a while.

Health officials said the most important prevention measure is careful hand washing with soap and warm running water. People are also requested to take a shower before getting into the pool.

Johnson County sees crypto cases every year, but there hasn't been an outbreak since 2011, when 89 cases were reported.

There have been 12 cases so far this year, with a spike in the last few days, so health officials said they're putting out the word now so it doesn't get worse.